If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( k )
k = 0
k = 0
k = 0
k in (-oo:0) U (0:+oo)
8/k = 12/30 // - 12/30
8/k-(12/30) = 0
8/k-2/5 = 0
8*k^-1 = 2/5 // : 8
k^-1 = 1/20
-1 < 0
1/(k^1) = 1/20 // * k^1
1 = 1/20*k^1 // : 1/20
20 = k^1
k = 20
k = 20
| 9-3=-11 | | 2x+x+14+x-38=18 | | 22=8(x-4)-2x | | 162=27(f-969) | | -12a^2+23a+20=0 | | -79+69= | | 2x1/1.7^2 | | -8y+6(y+4)=22 | | 3nb=5n-6z | | 24(q+995)=144 | | x-38=58-3x | | 22x+15x=228 | | 2/1.7 | | 2/3x-14=-81/3 | | 22x+15x=22 | | 12n+18-6a= | | 7-9=5 | | 2/3x-4=2) | | 4r^2-24r+36=0 | | a=2/t^2 | | 5x^4+15x^3+12x^2+36x=0 | | 3x+8y=5x+10y | | 7x=-20 | | x^2=1.91666666667 | | 6+-5(1)=x | | 2(20x-48)+14=504 | | 1000+5000(0.03)=r | | 2-70=75 | | 33333+38109283091= | | =sqrt(9(16*x^2)) | | 18*1.5*4*(-1/7)*(-3)*4 | | 3/4a=3/4-2/3a |